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Single Oil Soap - Stearic Acid

As a soapmaker, it can be really useful to know what properties an oil can contribute to your final bar of soap. Does it make it hard or soft? Does the oil contribute a lot of lather? Is the lather dense or light and fluffy? This information is really important, especially when you are considering which oils to use in your soap. What does this “luxury” or “filler” oil contribute to my bar? I hear a lot of people telling me that they don’t want any “filler” oils in their soap. They want an expensive luxury bar. Some “filler” oils are an important part of luxury bars. Come join me this week as we learn about ingredients that “make up” our soap.

Needed Materials

Stearic Acid
Lye (Sodium Hydroxide)
Microwave Safe Container
Immersion Blender


Recipe in Grams
454 grams Stearic Acid
63 grams Lye (Sodium Hydroxide)
177 mL Water
Recipe in Ounces
16 oz Stearic Acid
2.21 oz Lye (Sodium Hydroxide)
6 oz Water
Recipe in Percentages
100% Stearic Acid
Q.S. Lye (Sodium Hydroxide)
Q.S. Water

Weigh the Stearic Acid into a microwave safe container. Heat until liquid. This took over ten minutes for me. Add the lye to the water to for a lye solution. Mix the oils and lye solution and blend until trace is achieved. Pour into a mold and allow to sit for 24 hours. Cut the soap. Allow the soap to cure. Longer curing time will result in a harder bar. Enjoy!

I had some trouble when making this soap. The lye solution though hot, was so much cooler than the Stearic Acid the Stearic Acid became solid upon contact. It bubbles and steamed. I had to had about 6 more ounces of hot water to be able to even mix anything. It was quite startling to work with and I am not sure I ever want to make another pure Stearic Acid soap again.

After the soap had cured, it was really hard. When cutting it, the ends crumbled and broke. I snagged a piece to test at the sink. It was really hard, there was no lather and it felt almost waxy. It would be useful when you have a soft bar of soap but I wouldn’t make it a large percentage of your oils. We don’t recommend that you use more than 1/8 of an oz per pound of fats.


Finished Soap

Weighing Stearic Acid

Mixing Lye Solution

Adding Lye Solution to melted Stearic Acid

Lye Solution and Stearic Acid

Mixing Soap

Soap in Mold

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